US3753709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crosslinked resin overcoated electrophotographic elements useful in lithography
Assignee: Eastman Kodak Co
•
Filing: 1971-02-25
•
Granted: 1973-08-21
•
Expires: 1991-02-25
Abstract
Abstract Electrophotographic elements are provided with a conversion-free overcoat of a layer comprising a cross-linkable polymer and a crosslinking agent therefor. These elements are useful as lithographic printing masters without the need for a separate conversion step after development.
Inventors
- 👤 W Staudenmayer
- 👤 W Yoerger
- 👤 D Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:00
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/147; G03G5/14708; G03G5/14713; G03G5/14791; G03G13/00; G03G13/26; G03G13/28; G03G5/14717; G03G5/14734
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
40 words
An electrophotographic element as described in claim 1 wherein the overcoat layer consists of a blend in which the ratio of component (a) to component (b) is in the range from about 0.2 to 1 to about 3 to 1.
Claim 2
Dependent Claim
29 words
An electrophotographic element as described in claim 1 wherein said crosslinking agent is present in an amount of about 0.025 to about 5 percent by weight of the polymer.
Claim 3
Dependent Claim
22 words
An electrophotographic element as described in claim 1 wherein said electrically conductive support comprises a polymeric film coated with a conductive coating.
Claim 4
Dependent Claim
28 words
An electrophotographic element as described in claim 1 wherein the crosslinkable polymer blend in said overcoat layer consists essentially of a blend of polyvinyl acetate and polyacrylic acid.
Claim 5
Dependent Claim
39 words
An electrophotographic element as described in claim 1 wherein the crosslinkable polymer blend in said overcoat layer consists essentially of a blend of polyvinyl acetate and a copolymer of vinyl methyl ether and maleic anhydride or partial esters thereof.
Claim 6
Dependent Claim
34 words
An electrophotographic element as described in claim 1 wherein the crosslinkable polymer blend in said overcoat layer consists essentially of a blend of polyvinyl acetate and a copolymer of methyl acrylate and acrylic acid.
Claim 7
Dependent Claim
34 words
An electrophotographic element as described in claim 1 wherein the crosslinkable polymer blend in said overcoat layer consists essentially of a blend of polyvinyl acetate and a copolymer of butyl acrylate and acrylic acid.
Claim 8
Dependent Claim
34 words
An electrophotographic element as described in claim 1 wherein the crosslinkable polymer blend in said overcoat layer consists essentially of a blend of polyvinyl acetate and a copolymer of methyl methacrylate and methacrylic acid.
Claim 9
Dependent Claim
34 words
An electrophotographic element as described in claim 1 wherein the crosslinkable polymer blend in said overcoat layer consists essentially of a blend of polyacrylic acid and a copolymer of vinyl acetate and vinyl pyrrolidone.
Claim 10
Dependent Claim
45 words
An electrophotographic element as described in claim 1 wherein the crosslinkable polymer blend in said overcoat layer consists essentially of a blend of a copolymer of vinyl acetate and crotonic acid and a copolymer of vinyl methyl ether and maleic anhydride or partial esters thereof.
Claim 11
Dependent Claim
30 words
An electrophotographic element as described in claim 1 wherein the crosslinkable polymer blend consists essentially of a blend of poly(vinyl acetate) and a copolymer of acrylic acid and 2-acetoacetoxyethyl methacrylate.
Claim 12
Dependent Claim
145 words
An electrophotographic element comprising (1) an electrically conductive support, (2) an organic photoconductive insulating layer on one side of said support and (3) a hydrophilic overcoat layer on said photoconductive layer, said overcoat layer consisting essentially of a crosslinkable polymer blend and an organic crosslinking agent therefor, said polymer blend comprising (a) a vinyl acetate polymer and (b) a polymer of a member selected from the group consisting of an alpha-beta ethylenically unsaturated carboxylic acid, (i) an anhydride thereof and (ii) a partial alkyl ester thereof, the ratio of component (a) to component (b) in said blend on a weight basis being in the range from about 0.1 to 1 to about 10 to 1, the crosslinking agent being present in an amount within the range of from about 0.01 to less than 10 percent by weight based on the weight of the crosslinkable polymer.
Claim 13
Dependent Claim
15 words
An electrophotographic element as described in claim 13 wherein said crosslinking agent is butanedioldiglycidyl ether.
Claim 14
Dependent Claim
15 words
An electrophotographic element as described in claim 13 wherein said crosslinking agent is hexamethoxymethyl melamine.
Claim 15
Dependent Claim
143 words
An electrophotographic element comprising (1) an electrically conductive support, (2) an organic photoconductive insulating layer on one side of said support and (3) a hydrophilic overcoat layer on said photoConductive layer, said overcoat layer consisting essentially of a crosslinkable polymer blend and an organic crosslinking agent therefor, said polymer blend comprising (a) a vinyl acetate polymer and (b) a polymer of a member selected from the group consisting of an alkyl ester of an alpha-beta ethylenically unsaturated carboxylic acid containing an active methylene group, the ratio of component (a) to component (b) in said blend on a weight basis being in the range from about 0.1 to 1 to about 10 to 1, the crosslinking agent being present in an amount within the range of from about 0.01 to less than 10 percent by weight based on the weight of the crosslinking polymer.
Claim 16
Dependent Claim
14 words
An electrophotographic element as described in claim 16 wherein said crosslinking agent is glyoxal.
Claim 17
Dependent Claim
28 words
An electrophotographic element as described in claim 16 wherein said crosslinking agent is selected from the group consisting of a bis(vinylsulfonyl) compound, a polymeric aldehyde, formaldehyde and glyoxal.
References Cited (Backward Citations)
US3140174A
Cited
US3438773A
Cited
US3407064A
Cited
US3507647A
Cited
US3482970A
Cited
US3669657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |